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-rw-r--r--web/server/web_client.c315
1 files changed, 221 insertions, 94 deletions
diff --git a/web/server/web_client.c b/web/server/web_client.c
index bd275f5e..2da6c1de 100644
--- a/web/server/web_client.c
+++ b/web/server/web_client.c
@@ -16,8 +16,8 @@ inline int web_client_permission_denied(struct web_client *w) {
w->response.data->contenttype = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "You are not allowed to access this resource.");
- w->response.code = 403;
- return 403;
+ w->response.code = HTTP_RESP_FORBIDDEN;
+ return HTTP_RESP_FORBIDDEN;
}
static inline int web_client_crock_socket(struct web_client *w) {
@@ -337,7 +337,7 @@ static inline int access_to_file_is_not_permitted(struct web_client *w, const ch
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Access to file is not permitted: ");
buffer_strcat_htmlescape(w->response.data, filename);
- return 403;
+ return HTTP_RESP_FORBIDDEN;
}
int mysendfile(struct web_client *w, char *filename) {
@@ -357,7 +357,7 @@ int mysendfile(struct web_client *w, char *filename) {
w->response.data->contenttype = CT_TEXT_HTML;
buffer_sprintf(w->response.data, "Filename contains invalid characters: ");
buffer_strcat_htmlescape(w->response.data, filename);
- return 400;
+ return HTTP_RESP_BAD_REQUEST;
}
}
@@ -367,7 +367,7 @@ int mysendfile(struct web_client *w, char *filename) {
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Relative filenames are not supported: ");
buffer_strcat_htmlescape(w->response.data, filename);
- return 400;
+ return HTTP_RESP_BAD_REQUEST;
}
// find the physical file on disk
@@ -383,7 +383,7 @@ int mysendfile(struct web_client *w, char *filename) {
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "File does not exist, or is not accessible: ");
buffer_strcat_htmlescape(w->response.data, webfilename);
- return 404;
+ return HTTP_RESP_NOT_FOUND;
}
if ((statbuf.st_mode & S_IFMT) == S_IFDIR) {
@@ -422,14 +422,14 @@ int mysendfile(struct web_client *w, char *filename) {
buffer_sprintf(w->response.header, "Location: /%s\r\n", filename);
buffer_strcat(w->response.data, "File is currently busy, please try again later: ");
buffer_strcat_htmlescape(w->response.data, webfilename);
- return 307;
+ return HTTP_RESP_REDIR_TEMP;
}
else {
error("%llu: Cannot open file '%s'.", w->id, webfilename);
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Cannot open file: ");
buffer_strcat_htmlescape(w->response.data, webfilename);
- return 404;
+ return HTTP_RESP_NOT_FOUND;
}
}
@@ -451,7 +451,7 @@ int mysendfile(struct web_client *w, char *filename) {
#endif /* __APPLE__ */
buffer_cacheable(w->response.data);
- return 200;
+ return HTTP_RESP_OK;
}
@@ -570,7 +570,7 @@ static inline int check_host_and_call(RRDHOST *host, struct web_client *w, char
//if(unlikely(host->rrd_memory_mode == RRD_MEMORY_MODE_NONE)) {
// buffer_flush(w->response.data);
// buffer_strcat(w->response.data, "This host does not maintain a database");
- // return 400;
+ // return HTTP_RESP_BAD_REQUEST;
//}
return func(host, w, url);
@@ -603,13 +603,13 @@ int web_client_api_request(RRDHOST *host, struct web_client *w, char *url)
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Unsupported API version: ");
buffer_strcat_htmlescape(w->response.data, tok);
- return 404;
+ return HTTP_RESP_NOT_FOUND;
}
}
else {
buffer_flush(w->response.data);
buffer_sprintf(w->response.data, "Which API version?");
- return 400;
+ return HTTP_RESP_BAD_REQUEST;
}
}
@@ -687,25 +687,25 @@ const char *web_content_type_to_string(uint8_t contenttype) {
const char *web_response_code_to_string(int code) {
switch(code) {
- case 200:
+ case HTTP_RESP_OK:
return "OK";
- case 301:
+ case HTTP_RESP_MOVED_PERM:
return "Moved Permanently";
- case 307:
+ case HTTP_RESP_REDIR_TEMP:
return "Temporary Redirect";
- case 400:
+ case HTTP_RESP_BAD_REQUEST:
return "Bad Request";
- case 403:
+ case HTTP_RESP_FORBIDDEN:
return "Forbidden";
- case 404:
+ case HTTP_RESP_NOT_FOUND:
return "Not Found";
- case 412:
+ case HTTP_RESP_PRECOND_FAIL:
return "Preconditions Failed";
default:
@@ -772,7 +772,6 @@ static inline char *http_header_parse(struct web_client *w, char *s, int parse_u
// terminate the value
*ve = '\0';
- // fprintf(stderr, "HEADER: '%s' = '%s'\n", s, v);
uint32_t hash = simple_uhash(s);
if(hash == hash_origin && !strcasecmp(s, "Origin"))
@@ -812,65 +811,35 @@ static inline char *http_header_parse(struct web_client *w, char *s, int parse_u
return ve;
}
-// http_request_validate()
-// returns:
-// = 0 : all good, process the request
-// > 0 : request is not supported
-// < 0 : request is incomplete - wait for more data
-
-typedef enum {
- HTTP_VALIDATION_OK,
- HTTP_VALIDATION_NOT_SUPPORTED,
-#ifdef ENABLE_HTTPS
- HTTP_VALIDATION_INCOMPLETE,
- HTTP_VALIDATION_REDIRECT
-#else
- HTTP_VALIDATION_INCOMPLETE
-#endif
-} HTTP_VALIDATION;
-
-static inline HTTP_VALIDATION http_request_validate(struct web_client *w) {
- char *s = (char *)buffer_tostring(w->response.data), *encoded_url = NULL;
-
- size_t last_pos = w->header_parse_last_size;
- if(last_pos > 4) last_pos -= 4; // allow searching for \r\n\r\n
- else last_pos = 0;
-
- w->header_parse_tries++;
- w->header_parse_last_size = buffer_strlen(w->response.data);
-
- if(w->header_parse_tries > 1) {
- if(w->header_parse_last_size < last_pos)
- last_pos = 0;
-
- if(strstr(&s[last_pos], "\r\n\r\n") == NULL) {
- if(w->header_parse_tries > 10) {
- info("Disabling slow client after %zu attempts to read the request (%zu bytes received)", w->header_parse_tries, buffer_strlen(w->response.data));
- w->header_parse_tries = 0;
- w->header_parse_last_size = 0;
- web_client_disable_wait_receive(w);
- return HTTP_VALIDATION_NOT_SUPPORTED;
- }
-
- return HTTP_VALIDATION_INCOMPLETE;
- }
- }
-
+/**
+ * Valid Method
+ *
+ * Netdata accepts only three methods, including one of these three(STREAM) is an internal method.
+ *
+ * @param w is the structure with the client request
+ * @param s is the start string to parse
+ *
+ * @return it returns the next address to parse case the method is valid and NULL otherwise.
+ */
+static inline char *web_client_valid_method(struct web_client *w, char *s) {
// is is a valid request?
if(!strncmp(s, "GET ", 4)) {
- encoded_url = s = &s[4];
+ s = &s[4];
w->mode = WEB_CLIENT_MODE_NORMAL;
}
else if(!strncmp(s, "OPTIONS ", 8)) {
- encoded_url = s = &s[8];
+ s = &s[8];
w->mode = WEB_CLIENT_MODE_OPTIONS;
}
else if(!strncmp(s, "STREAM ", 7)) {
+ s = &s[7];
+
#ifdef ENABLE_HTTPS
- if ( (w->ssl.flags) && (netdata_use_ssl_on_stream & NETDATA_SSL_FORCE)){
+ if (w->ssl.flags && web_client_is_using_ssl_force(w)){
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
+
char hostname[256];
char *copyme = strstr(s,"hostname=");
if ( copyme ){
@@ -891,29 +860,150 @@ static inline HTTP_VALIDATION http_request_validate(struct web_client *w) {
hostname[13] = 0x00;
}
error("The server is configured to always use encrypt connection, please enable the SSL on slave with hostname '%s'.",hostname);
- return HTTP_VALIDATION_NOT_SUPPORTED;
+ s = NULL;
}
#endif
- encoded_url = s = &s[7];
w->mode = WEB_CLIENT_MODE_STREAM;
}
else {
+ s = NULL;
+ }
+
+ return s;
+}
+
+/**
+ * Set Path Query
+ *
+ * Set the pointers to the path and query string according to the input.
+ *
+ * @param w is the structure with the client request
+ * @param s is the first address of the string.
+ * @param ptr is the address of the separator.
+ */
+static void web_client_set_path_query(struct web_client *w, char *s, char *ptr) {
+ w->url_path_length = (size_t)(ptr -s);
+
+ w->url_search_path = ptr;
+}
+
+/**
+ * Split path query
+ *
+ * Do the separation between path and query string
+ *
+ * @param w is the structure with the client request
+ * @param s is the string to parse
+ */
+void web_client_split_path_query(struct web_client *w, char *s) {
+ //I am assuming here that the separator character(?) is not encoded
+ char *ptr = strchr(s, '?');
+ if(ptr) {
+ w->separator = '?';
+ web_client_set_path_query(w, s, ptr);
+ return;
+ }
+
+ //Here I test the second possibility, the URL is completely encoded by the user.
+ //I am not using the strcasestr, because it is fastest to check %3f and compare
+ //the next character.
+ //We executed some tests with "encodeURI(uri);" described in https://www.w3schools.com/jsref/jsref_encodeuri.asp
+ //on July 1st, 2019, that show us that URLs won't have '?','=' and '&' encoded, but we decided to move in front
+ //with the next part, because users can develop their own encoded that won't follow this rule.
+ char *moveme = s;
+ while (moveme) {
+ ptr = strchr(moveme, '%');
+ if(ptr) {
+ char *test = (ptr+1);
+ if (!strncmp(test, "3f", 2) || !strncmp(test, "3F", 2)) {
+ w->separator = *ptr;
+ web_client_set_path_query(w, s, ptr);
+ return;
+ }
+ ptr++;
+ }
+
+ moveme = ptr;
+ }
+
+ w->separator = 0x00;
+ w->url_path_length = strlen(s);
+ w->url_search_path = NULL;
+}
+
+/**
+ * Request validate
+ *
+ * @param w is the structure with the client request
+ *
+ * @return It returns HTTP_VALIDATION_OK on success and another code present
+ * in the enum HTTP_VALIDATION otherwise.
+ */
+static inline HTTP_VALIDATION http_request_validate(struct web_client *w) {
+ char *s = (char *)buffer_tostring(w->response.data), *encoded_url = NULL;
+
+ size_t last_pos = w->header_parse_last_size;
+
+ w->header_parse_tries++;
+ w->header_parse_last_size = buffer_strlen(w->response.data);
+
+ int is_it_valid;
+ if(w->header_parse_tries > 1) {
+ if(last_pos > 4) last_pos -= 4; // allow searching for \r\n\r\n
+ else last_pos = 0;
+
+ if(w->header_parse_last_size < last_pos)
+ last_pos = 0;
+
+ is_it_valid = url_is_request_complete(s, &s[last_pos], w->header_parse_last_size);
+ if(!is_it_valid) {
+ if(w->header_parse_tries > 10) {
+ info("Disabling slow client after %zu attempts to read the request (%zu bytes received)", w->header_parse_tries, buffer_strlen(w->response.data));
+ w->header_parse_tries = 0;
+ w->header_parse_last_size = 0;
+ web_client_disable_wait_receive(w);
+ return HTTP_VALIDATION_NOT_SUPPORTED;
+ }
+
+ return HTTP_VALIDATION_INCOMPLETE;
+ }
+
+ is_it_valid = 1;
+ } else {
+ last_pos = w->header_parse_last_size;
+ is_it_valid = url_is_request_complete(s, &s[last_pos], w->header_parse_last_size);
+ }
+
+ s = web_client_valid_method(w, s);
+ if (!s) {
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
+
return HTTP_VALIDATION_NOT_SUPPORTED;
+ } else if (!is_it_valid) {
+ //Invalid request, we have more data after the end of message
+ char *check = strstr((char *)buffer_tostring(w->response.data), "\r\n\r\n");
+ if(check) {
+ check += 4;
+ if (*check) {
+ w->header_parse_tries = 0;
+ w->header_parse_last_size = 0;
+ web_client_disable_wait_receive(w);
+ return HTTP_VALIDATION_NOT_SUPPORTED;
+ }
+ }
+
+ web_client_enable_wait_receive(w);
+ return HTTP_VALIDATION_INCOMPLETE;
}
- // find the SPACE + "HTTP/"
- while(*s) {
- // find the next space
- while (*s && *s != ' ') s++;
+ //After the method we have the path and query string together
+ encoded_url = s;
- // is it SPACE + "HTTP/" ?
- if(*s && !strncmp(s, " HTTP/", 6)) break;
- else s++;
- }
+ //we search for the position where we have " HTTP/", because it finishes the user request
+ s = url_find_protocol(s);
// incomplete requests
if(unlikely(!*s)) {
@@ -924,6 +1014,10 @@ static inline HTTP_VALIDATION http_request_validate(struct web_client *w) {
// we have the end of encoded_url - remember it
char *ue = s;
+ //Variables used to map the variables in the query string case it is present
+ int total_variables;
+ char *ptr_variables[WEB_FIELDS_MAX];
+
// make sure we have complete request
// complete requests contain: \r\n\r\n
while(*s) {
@@ -941,15 +1035,41 @@ static inline HTTP_VALIDATION http_request_validate(struct web_client *w) {
// a valid complete HTTP request found
*ue = '\0';
- url_decode_r(w->decoded_url, encoded_url, NETDATA_WEB_REQUEST_URL_SIZE + 1);
+ if(w->mode != WEB_CLIENT_MODE_NORMAL) {
+ if(!url_decode_r(w->decoded_url, encoded_url, NETDATA_WEB_REQUEST_URL_SIZE + 1))
+ return HTTP_VALIDATION_MALFORMED_URL;
+ } else {
+ web_client_split_path_query(w, encoded_url);
+
+ if (w->separator) {
+ *w->url_search_path = 0x00;
+ }
+
+ if(!url_decode_r(w->decoded_url, encoded_url, NETDATA_WEB_REQUEST_URL_SIZE + 1))
+ return HTTP_VALIDATION_MALFORMED_URL;
+
+ if (w->separator) {
+ *w->url_search_path = w->separator;
+
+ char *from = (encoded_url + w->url_path_length);
+ total_variables = url_map_query_string(ptr_variables, from);
+
+ if (url_parse_query_string(w->decoded_query_string, NETDATA_WEB_REQUEST_URL_SIZE + 1, ptr_variables, total_variables)) {
+ return HTTP_VALIDATION_MALFORMED_URL;
+ }
+ }
+ }
*ue = ' ';
-
+
// copy the URL - we are going to overwrite parts of it
// TODO -- ideally we we should avoid copying buffers around
strncpyz(w->last_url, w->decoded_url, NETDATA_WEB_REQUEST_URL_SIZE);
+ if (w->separator) {
+ *w->url_search_path = 0x00;
+ }
#ifdef ENABLE_HTTPS
if ( (!web_client_check_unix(w)) && (netdata_srv_ctx) ) {
- if ((w->ssl.conn) && ((w->ssl.flags & NETDATA_SSL_NO_HANDSHAKE) && (netdata_use_ssl_on_http & NETDATA_SSL_FORCE) && (w->mode != WEB_CLIENT_MODE_STREAM)) ) {
+ if ((w->ssl.conn) && ((w->ssl.flags & NETDATA_SSL_NO_HANDSHAKE) && (web_client_is_using_ssl_force(w) || web_client_is_using_ssl_default(w)) && (w->mode != WEB_CLIENT_MODE_STREAM)) ) {
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
@@ -997,7 +1117,7 @@ static inline ssize_t web_client_send_data(struct web_client *w,const void *buf,
}
static inline void web_client_send_http_header(struct web_client *w) {
- if(unlikely(w->response.code != 200))
+ if(unlikely(w->response.code != HTTP_RESP_OK))
buffer_no_cacheable(w->response.data);
// set a proper expiration date, if not already set
@@ -1027,7 +1147,7 @@ static inline void web_client_send_http_header(struct web_client *w) {
}
char headerbegin[8328];
- if (w->response.code == 301) {
+ if (w->response.code == HTTP_RESP_MOVED_PERM) {
memcpy(headerbegin,"\r\nLocation: https://",20);
size_t headerlength = strlen(w->host);
memcpy(&headerbegin[20],w->host,headerlength);
@@ -1210,7 +1330,7 @@ static inline int web_client_switch_host(RRDHOST *host, struct web_client *w, ch
if(host != localhost) {
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "Nesting of hosts is not allowed.");
- return 400;
+ return HTTP_RESP_BAD_REQUEST;
}
char *tok = mystrsep(&url, "/");
@@ -1234,7 +1354,7 @@ static inline int web_client_switch_host(RRDHOST *host, struct web_client *w, ch
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "This netdata does not maintain a database for host: ");
buffer_strcat_htmlescape(w->response.data, tok?tok:"");
- return 404;
+ return HTTP_RESP_NOT_FOUND;
}
static inline int web_client_process_url(RRDHOST *host, struct web_client *w, char *url) {
@@ -1279,7 +1399,7 @@ static inline int web_client_process_url(RRDHOST *host, struct web_client *w, ch
w->response.data->contenttype = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
config_generate(w->response.data, 0);
- return 200;
+ return HTTP_RESP_OK;
}
#ifdef NETDATA_INTERNAL_CHECKS
else if(unlikely(hash == hash_exit && strcmp(tok, "exit") == 0)) {
@@ -1296,7 +1416,7 @@ static inline int web_client_process_url(RRDHOST *host, struct web_client *w, ch
error("web request to exit received.");
netdata_cleanup_and_exit(0);
- return 200;
+ return HTTP_RESP_OK;
}
else if(unlikely(hash == hash_debug && strcmp(tok, "debug") == 0)) {
if(unlikely(!web_client_can_access_netdataconf(w)))
@@ -1317,7 +1437,7 @@ static inline int web_client_process_url(RRDHOST *host, struct web_client *w, ch
buffer_strcat(w->response.data, "Chart is not found: ");
buffer_strcat_htmlescape(w->response.data, tok);
debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
- return 404;
+ return HTTP_RESP_NOT_FOUND;
}
debug_flags |= D_RRD_STATS;
@@ -1331,12 +1451,12 @@ static inline int web_client_process_url(RRDHOST *host, struct web_client *w, ch
buffer_sprintf(w->response.data, "Chart has now debug %s: ", rrdset_flag_check(st, RRDSET_FLAG_DEBUG)?"enabled":"disabled");
buffer_strcat_htmlescape(w->response.data, tok);
debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, rrdset_flag_check(st, RRDSET_FLAG_DEBUG)?"enabled":"disabled");
- return 200;
+ return HTTP_RESP_OK;
}
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "debug which chart?\r\n");
- return 400;
+ return HTTP_RESP_BAD_REQUEST;
}
else if(unlikely(hash == hash_mirror && strcmp(tok, "mirror") == 0)) {
if(unlikely(!web_client_can_access_netdataconf(w)))
@@ -1350,7 +1470,7 @@ static inline int web_client_process_url(RRDHOST *host, struct web_client *w, ch
// just leave the buffer as is
// it will be copied back to the client
- return 200;
+ return HTTP_RESP_OK;
}
#endif /* NETDATA_INTERNAL_CHECKS */
}
@@ -1395,7 +1515,7 @@ void web_client_process_request(struct web_client *w) {
w->response.data->contenttype = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "OK");
- w->response.code = 200;
+ w->response.code = HTTP_RESP_OK;
break;
case WEB_CLIENT_MODE_FILECOPY:
@@ -1424,7 +1544,7 @@ void web_client_process_request(struct web_client *w) {
buffer_flush(w->response.data);
buffer_sprintf(w->response.data, "Received request is too big (%zu bytes).\r\n", w->response.data->len);
- w->response.code = 400;
+ w->response.code = HTTP_RESP_BAD_REQUEST;
}
else {
// wait for more data
@@ -1437,16 +1557,23 @@ void web_client_process_request(struct web_client *w) {
buffer_flush(w->response.data);
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "<!DOCTYPE html><!-- SPDX-License-Identifier: GPL-3.0-or-later --><html><body onload=\"window.location.href ='https://'+ window.location.hostname + ':' + window.location.port + window.location.pathname\">Redirecting to safety connection, case your browser does not support redirection, please click <a onclick=\"window.location.href ='https://'+ window.location.hostname + ':' + window.location.port + window.location.pathname\">here</a>.</body></html>");
- w->response.code = 301;
+ w->response.code = HTTP_RESP_MOVED_PERM;
break;
}
#endif
+ case HTTP_VALIDATION_MALFORMED_URL:
+ debug(D_WEB_CLIENT_ACCESS, "%llu: URL parsing failed (malformed URL). Cannot understand '%s'.", w->id, w->response.data->buffer);
+
+ buffer_flush(w->response.data);
+ buffer_strcat(w->response.data, "URL not valid. I don't understand you...\r\n");
+ w->response.code = HTTP_RESP_BAD_REQUEST;
+ break;
case HTTP_VALIDATION_NOT_SUPPORTED:
debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, w->response.data->buffer);
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "I don't understand you...\r\n");
- w->response.code = 400;
+ w->response.code = HTTP_RESP_BAD_REQUEST;
break;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 04:34:25 +0000